JPH05194897A - Hot-melt ink composition for ink jet recording - Google Patents

Abstract

PURPOSE:To greatly improve the light transmittance of an ink itself without the help of a post-treatment apparatus such as a roller. CONSTITUTION:An ink compsn. which is solid at room temp. and capable of forming recording dots through liquefaction thereof by heating and subsequent ejection thereof toward paper by application thereto of any energy comprises 25-65wt.% polyamide resin, 5-30wt.% amide or triglyceride of a fatty acid, 0-25wt.% wax, and 0.5-5wt.% dye. This ink compsn. is greatly improved in transparency on an OHP sheet.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ink jet hot melt type ink composition.

[0002]

2. Description of the Related Art Conventionally, a water-soluble liquid ink composition has been widely used as an ink composition for ink jet recording. However, "bleeding" occurs in recording on paper where ink easily penetrates, and the paper is limited to processed paper. Further, even when recording on an OHP (overhead projector) sheet, a special treatment is required on the surface of the sheet due to poor ink drying property. Therefore, as an ink composition that provides good print quality regardless of paper quality, a hot-melt type ink composition made of a wax that is solid at room temperature is used, and is liquefied by heating, and some energy is applied to the paper. A hot-melt ink jet recording method has been proposed in which the ink is jetted upward and solidified by cooling on paper to form recording dots.

As a great advantage of this hot melt type ink jet system, since the ink is solid at room temperature, it does not stain during handling. No nozzle clogging because the amount of evaporation of ink in the molten state can be minimized. Because it is fast-drying, it has no "bleeding" and can be used for various papers such as Japanese paper, drawing paper, and postcards without pretreatment.

However, since the ink is mainly composed of wax, it has a drawback that the transparency of the ink on the OHP sheet is poor. Conventionally, in order to improve this transparency, the necessary transparency is obtained by using a post-processing device that prevents the scattering of light by smoothing the ink fixed on the paper surface by applying pressure from above and below with a heat roller, Not perfect yet.

[0005]

As described above, the hot-melt type ink jet recording system has many advantages as compared with the water-based ink jet recording system and is expected to be applied to OA equipment, general household printers, facsimiles and the like. . However, there is a problem with the transparency of the ink on the OHP sheet,
It is a bottleneck for commercialization.

The present invention has been made in view of the above points, and provides an ink jet hot-melt type ink composition capable of greatly improving the light transmittance of the ink itself without depending on a post-treatment device such as a roller. The purpose is to do.

[0007]

The above object is to provide an ink composition containing (a) a polyamide resin in an amount of 25 to 65% by weight and (b) a fatty acid amide or triglyceride in an amount of 5 to 5% by weight.
It is achieved by including 30 weight percent, (c) wax 0 to 25 weight percent, and (d) dye 0.5 to 5 weight percent.

As a result of intensive studies to improve the light transmittance of the ink itself without relying on a post-treatment device, the above composition was obtained.

At least one selected from the group consisting of aromatic polyamide and dimer acid polyamide is used as the polyamide resin which is a component having excellent transparency of the ink on the OHP sheet.
One kind or a mixture of two or more kinds can be used. This polyamide resin system has a characteristic of excellent transparency. However, if it exceeds 65% by weight, the viscosity becomes high and it becomes difficult to eject the ink. Therefore, 58.8% by weight is preferable. When it becomes less than 25 weight percent,
The effect of adding polyamide resin is lost.

Next, a saturated or unsaturated fatty acid amide is desirable as the fatty acid amide.

Specifically, as fatty acid amides, lauric acid amide, stearic acid amide, oleic acid amide, erucic acid amide, ricinoleic acid amide, 1.2-hydroxystearic acid amide, palmitic acid amide, behenic acid amide, brassic acid amide. As an N-substituted fatty acid amide, N.I. N'-ethylenebisoleic acid amide, N.I. N '
-Xylene bisstearic acid amide, stearic acid monomethylolamide, N-oleylstearic acid amide,
N-stearyl stearic acid amide, N-oleyl palmitic acid amide, N-stearyl erucic acid amide, N.I.
N'-dioleyl adipamide, N.I. N'-dioleoyl sebacic acid amide, N.I. At least one kind selected from N'-distearyl isophthalic acid amide or the like can be used in combination.

This fatty acid amide type is remarkable in the effect of lowering the melting point of the ink and the effect of lowering the viscosity at the time of melting. Triglyceride is also effective. However, when the amount exceeds 30% by weight, the transparency of the ink decreases, so
9.6 weight percent is desirable. On the other hand, when it is less than 5% by weight, the function of lowering the viscosity is not fulfilled.

Examples of the waxes include paraffin wax selected from petroleum waxes, carnauba wax, montan wax and the like.

Specifically, microcrystalline wax, montanic acid wax and their derivatives are selected from the viewpoints of dye solubility, melting point and stability. However, if it exceeds 25% by weight, the transparency of the ink decreases, so
9.6 weight percent is desirable. Further, when it is not necessary to add a wax in terms of dye solubility, melting point and stability, it may not be used.

As the dye, a soluble dye (Solvent Dye) which is soluble in the above vehicle and is excellent in thermal stability is desirable. Any dye can be used so long as it is compatible with the other ink components.

Specifically, there are the following.

<Magenta Dye> MS Magenta
VP, MS Magenta HM-1450, MS
Magenta HSo-147 (Mitsui Toatsu), AIZ
ENSOT Red-1, AIZEN SOT Red
-2, AIZEN SOTRed-3, AIZEN S
OT Pink-1, SPIRON Red GEH
SPECIAL, RESOLIN R
ed FB 200%, MACROLEX Red V
iolet R, MACROLEX ROT 5B (Bayer Japan), KAYASET Red B, KA
YASETRed 130, KAYASET Red
802 (Nippon Kayaku), PHLOXIN, ROSE BE
NGAL, ACID Red (Daiwa Kasei), HSR-
31, DIARESIN Red K (Mitsubishi Kasei), O
il Red (BASF Japan).

<Cyan dye> MS Cyan HM-1
238, MS Cyan HSo-16, Cyan H
So-144, MS Cyan VPG (Mitsui Toatsu),
AIZEN SOT Blue-4 (Hodogaya Chemical), R
ESOLIN BR, Blue BGLN 200%,
MACREX Blue RR, CERES Bl
ue GN, SIRIUS SUPRATURQ. Bl
ue Z-BGL, SIRIUS SUPRA TUR
Q. Blue FB-LL 330% (Bayer Japan), KAYASET Blue FR, KAYASE
T Blue N, KAYASET Blue 81
4, Turq. Blue GL-5 200, Light
t Blue BGL-5 200 (Nippon Kayaku), DA
IWA Blue 7000, Oleosol Fas
t Blue GL (Daiwa Kasei), DIARESIN
Blue P (Mitsubishi Kasei), SUDAN Blue
670, NEOPEN Blue 808, ZAPON
Blue 806 (BASF Japan).

<Yellow Dye> MS Yellow H
Sm-41, Yellow KX-7, Yellow
EX-27 (Mitsui Toatsu), AIZEN SOT Yel
low-1, AIZEN SOT Yellow-3,
AIZEN SOT Yellow-6 (Hodogaya Kagaku), MACROLEX Yellow 6G, MAC
ROLEX FLUOR, Yellow 10GN (Bayer Japan), KAYASET Yellow S
FG, KAYASET Yellow 2G, KAY
ASET Yellow AG, KAYASET Y
ellow EG (Nippon Kayaku), DAIWA Yel
low 330HB (Daiwa Kasei), HSY-68 (Mitsubishi Kasei), SUDAN Yellow 146, NEO
PEN Yellow 075 (BASF Japan).

<Black dye> MS Black VP
C (Mitsui Toatsu), AIZEN SOT Black-
1, AIZEN SOT Black-5 (Hodogaya Chemical Co., Ltd.), RESORIN Black GSN 200
%, RESOLIN BlackBS (Bayer Japan), KAYASET Black A-N (Nippon Kayaku), DAIWA Black MSC (Daiwa Kasei), HSB-202 (Mitsubishi Kasei), NEPTUNE
Black X60, NEOPEN Black X5
8 (BASF Japan) and the like.

A suitable amount of the dye added is 1 to 3 weight percent of the ink. Below 0.5 weight percent, the image quality is degraded. Further, two or more kinds of dyes can be mixed and used at appropriate times for color adjustment and the like.

In order to further exhibit the functionality of the ink composition of the present invention, various surface treating agents, surfactants, viscosity reducing agents, antioxidants, preservatives and the like can be mixed.

[0023]

Since the above means is provided, the light transmittance of the ink itself is significantly improved.

[0024]

EXAMPLES Next, the present invention will be specifically described by way of examples. Examples of the present invention are shown in Tables 1, 2 and 3. Tables 1 and 2 show the test results of the ink composition, the transmittance of the ink coating film by the test piece, the transparency, the adhesion, etc., and Table 3 shows the manufacturer name, the product name, etc. of the material used for the ink composition. . That is, Table 3 shows the manufacturer names of polyamide symbol A-, fatty acid amide symbol F-, triglyceride symbol G-, wax symbol W-, magenta dye M, cyan dye C, yellow dye Y, and black dye Bk in Tables 1 and 2. ,
I wrote down the product name.

[0025]

[Table 1]

[0026]

[Table 2]

[0027]

[Table 3]

Example 1 Polyamide (manufactured by Fuji Kasei,
Trade name: TOMYD TXD-101) 58.8% by weight, fatty acid amide (manufactured by Wako Pure Chemical Industries, chemical name: stearic acid amide) 19.6% by weight, montanic acid wax (manufactured by Hoechst Japan, trade name: Hoechst Wax S) ) 19.6 weight percent and magenta dye (Hodogaya Chemical Co., Ltd., trade name: AIZEN SOT Pink-
1) Magenta hot melt inks were prepared by mixing 2.0 weight percent (see Tables 1 to 3). This mixture is heated at 120 + 10 ° C until a homogeneous molten mixture is obtained (about 2 hours), followed by heat and pressure filtration to remove impurities, etc., and then allowed to cool at room temperature to obtain a homogeneous magenta hot melt. I got the ink.

A sample of this magenta hot melt ink was coated on an OHP transparent sheet (made by Sakurai, trade name: Star) by hand while the ink was in a molten state to form an ink coating film having a thickness of about 15 to 30 μm. Obtained. Using a test piece obtained by cutting the ink-coated OHP sheet into a width of 15 mm and a length of 50 mm, the transmittance was measured with a spectrophotometer (Hitachi Model 330). As for transparency, the above test piece was tested by OHP (3M, M-4000).
The image was projected and the visual judgment was made. Further, in order to evaluate the adhesion of the ink film on the OHP sheet, the test piece was wound around a 1/8 inch mandrel and squeezed twice at room temperature to observe the degree of ink film peeling. As is clear from Table 2, the results of Example 1 have high transmittance, transparency,
Excellent adhesion.

Example 2 A hot melt ink was prepared in the same manner as in Example 1 except that lauric acid amide (a reagent manufactured by Wako Pure Chemical Industries, Ltd.) was used in place of the stearic acid amide of Example 1 as the fatty acid amide. Was adjusted (see Tables 1 to 3). The results of the characteristic evaluation conducted in the same manner as in Example 1 show that, as is clear from Table 2, the transmittance is high and the transparency and adhesion are excellent as in Example 1.

Example 3 A hot melt ink was prepared in the same manner as in Example 1 except that oleic acid amide (a reagent manufactured by Wako Pure Chemical Industries, Ltd.) was used in place of the stearic acid amide of Example 1 for the fatty acid amide. Was adjusted (see Tables 1 to 3). The results of the characteristic evaluation conducted in the same manner as in Example 1 show that, as is clear from Table 2, the transmittance is high and the transparency and adhesion are excellent as in Example 1.

Example 4 Instead of the stearic acid amide of Example 1, fatty acid amide was replaced with oleic acid amide (a reagent manufactured by Wako Pure Chemical Industries, Ltd.), and the dye was AIZEN SOT Pin.
Cyan dye instead of k-1 (manufactured by Daiwa Kasei, trade name:
Hot melt type inks were prepared in the same manner as in Example 1 except that Oleosol Fast Blue GL) was used (see Tables 1 to 3). Further, as is clear from Table 2, the results of characteristic evaluation performed in the same manner as in Example 1
Similar to the above, it has high transmittance, and also has excellent transparency and adhesion.

[Example 5] Instead of the stearic acid amide of Example 1, fatty acid amide was replaced with oleic acid amide (a reagent manufactured by Wako Pure Chemical Industries, Ltd.), and the dye was AIZEN SOT Pin.
Yellow dye instead of k-1 (manufactured by BASF Japan,
Hot melt type inks were prepared in the same manner as in Example 1 except that the trade name: NEOPEN Yellow 075) was used (see Tables 1 to 3). The results of the characteristic evaluation conducted in the same manner as in Example 1 show that, as is clear from Table 2, the transmittance is high and the transparency and adhesion are excellent as in Example 1.

Example 6 Instead of the stearic acid amide of Example 1, fatty acid amide was replaced with oleic acid amide (a reagent manufactured by Wako Pure Chemical Industries, Ltd.), and the dye was AIZEN SOT Pin.
Black dye instead of k-1 (made by Bayer Japan,
Hot melt type inks were prepared in the same manner as in Example 1 except that the trade name: RESOLIN Black BS) was used (see Tables 1 to 3). The results of the characteristic evaluation conducted in the same manner as in Example 1 show that, as is clear from Table 2, the transmittance is high and the transparency and adhesion are excellent as in Example 1.

Example 7 A polyamide was used in place of the tomide TXD-101 of Example 1 except that the tomide 92 was used.
Hot melt type inks were prepared in the same manner as in Example 1 except that (Fuji Kasei) was used (see Tables 1 to 3). The results of the characteristic evaluation conducted in the same manner as in Example 1 show that, as is clear from Table 2, the transmittance is high and the transparency and adhesion are excellent as in Example 1.

Example 8 Polyamide was used in place of the tomide TXD-101 of Example 2 except that the tomide 92 was used.
Hot melt type inks were prepared in the same manner as in Example 2 except that (Fuji Kasei) was used (see Tables 1 to 3). Further, as is clear from Table 2, the characteristic evaluation results carried out in the same manner as in Example 2 show that, as in Example 2, the transmittance is high and the transparency and adhesion are excellent.

[Example 9] A polyamide was used instead of the tomide TXD-101 of Example 3 in 92.
Hot melt inks were prepared in the same manner as in Example 3 except that (Fuji Kasei) was used (see Tables 1 to 3). Further, as is clear from Table 2, the characteristic evaluation results performed in the same manner as in Example 3 show that the transmittance is high and the transparency and adhesion are excellent as in Example 3.

[Example 10] The proportions of stearic acid amide and Hoechst wax S were changed (the stearic acid amide was changed from 19.6 weight percent of Example 7 to 25 weight percent, and Hoechst wax S of 19. Hot melt type inks were prepared in the same manner as in Example 7 except that the amount was changed from 6% by weight to 14.2% by weight (see Tables 1 to 3). The results of the characteristic evaluation conducted in the same manner as in Example 7 show Example 7 as shown in Table 2.
The transmittance is lower than that of and the transparency is poor.

[Example 11] The proportions of stearic acid amide and Hoechst wax S were changed (the stearic acid amide was changed from 19.6 weight percent of Example 7 to 14.2 weight percent, and Hoechst wax S of Example 7 was changed. 19.
Hot melt type inks were prepared in the same manner as in Example 7 except that the amount was changed from 6% by weight to 25% by weight (see Tables 1 to 3). The results of the characteristic evaluation conducted in the same manner as in Example 7 show Example 7 as shown in Table 2.
The transmittance is lower than that of and the transparency is poor.

Example 12 A polyamide was used in place of the tomide TXD-101 of Example 1 except that the tomide 90 was used.
Hot melt type inks were prepared in the same manner as in Example 1 except that (Fuji Kasei) was used (see Tables 1 to 3). The results of the characteristic evaluation conducted in the same manner as in Example 1 show that, as is clear from Table 2, the transmittance is high and the transparency and adhesion are excellent as in Example 1.

Example 13 A polyamide was used in place of the tomide TXD-101 of Example 2 except that the tomide 90 was used.
Hot melt type inks were prepared in the same manner as in Example 2 except that (Fuji Kasei) was replaced with Hoechst wax E (manufactured by Hoechst Japan) instead of Hoechst wax S (see Tables 1 to 3). . Further, as is clear from Table 2, the characteristic evaluation results carried out in the same manner as in Example 2 show that, as in Example 2, the transmittance is high and the transparency and adhesion are excellent.

Example 14 Polyamide was used instead of the tomide TXD-101 of Example 3 in Versamide 33.
5 (manufactured by Henkel Japan) was prepared in the same manner as in Example 3 except that NPS-6010 (manufactured by Hoechst Japan) was used instead of Hoechst wax S (see Tables 1 to 3). ). Further, the results of the characteristic evaluation conducted in the same manner as in Example 3 show that the transmittance is high and the transparency and adhesion are excellent as in Example 3.

[Example 15] Instead of the fatty acid amide of Example 1, triglyceride (manufactured by NOF CORPORATION, trade name:
Hot melt inks were prepared in the same manner as in Example 1 except that Panacet 1000) was used (Tables 1 to 3).
reference). Further, the characteristic evaluation results performed in the same manner as in Example 1 show that the transmittance is high as in Example 1, as is clear from Table 2.
Excellent transparency and adhesion.

[Example 16] Instead of the fatty acid amide of Example 7, triglyceride (manufactured by NOF CORPORATION, trade name:
A hot melt ink was prepared in the same manner as in Example 7 except that Panacet 1000) was used (Tables 1 to 3).
reference). In addition, the characteristic evaluation results performed in the same manner as in Example 7 show that the transmittance is high as in Example 7, as is clear from Table 2.
Excellent transparency and adhesion.

Example 17 Example 12 was repeated except that triglyceride (trade name: Panacet 1000, manufactured by NOF CORPORATION) was used in place of the fatty acid amide of Example 12.
A hot melt ink was prepared in the same manner as in (Table 1
~ See Table 3). Further, as is clear from Table 2, the characteristic evaluation results performed in the same manner as in Example 12 show that the transmittance is high and the transparency and adhesion are excellent as in Example 12.

[Embodiment 18] Tomeide 9 of Embodiment 9
2 (manufactured by Fuji Kasei) from 58.8% by weight to 55.9% by weight, as a viscosity reducing agent for lowering the viscosity of the polyamide resin, exepal HD-PB
Were prepared in the same manner as in Example 9 except that 2.9% by weight was added (see Tables 1 to 3). In addition, the characteristic evaluation performed in the same manner as in Example 9 is shown in Table 2.
As is clear from the above, as in Example 3, the transmittance is high and the transparency and adhesion are excellent. Moreover, handling of the hot melt ink becomes easy.

Comparative Example 1 98% by weight of Hoechst wax S was mixed with AIZEN SOT of the magenta dye.
Magenta hot melt inks were prepared by mixing 2.0 weight percent of Pink-1 (see Tables 1-3). Further, as is clear from Table 2, the results of characteristic evaluation performed in the same manner as in Example 1 show that the transmittance is lower than in Example 1, the transparency is poor, and the adhesion is poor.

[Comparative Example 2] 98% by weight of Hoechst wax E was mixed with AIZEN SOT of the magenta dye.
Magenta hot melt inks were prepared by mixing 2.0 weight percent of Pink-1 (see Tables 1-3). Further, as is clear from Table 2, the results of characteristic evaluation performed in the same manner as in Example 1 show that the transmittance is lower than in Example 1, the transparency is poor, and the adhesion is poor.

[Comparative Example 3] TOMYD TXD-101
To 32 weight percent, Hoechst wax S to 66 weight percent, and the magenta dye AIZEN SOT P
Magenta hot melt inks were prepared by mixing 2.0 weight percent of ink-1 (Table 1
~ See Table 3). Further, as is clear from Table 2, the results of characteristic evaluation performed in the same manner as in Example 1 have lower transmittance and poorer transparency than Example 1.

Comparative Example 4 32 stearic acid amide was added.
Weight percent, Hoechst wax S to 66 weight percent, magenta dye AIZEN SOT Pink
-1 by mixing 2.0 weight percent,
Magenta hot melt inks were prepared (Table 1 to Table 3
reference). Further, the results of the characteristic evaluation conducted in the same manner as in Example 1 show that the transmittance is lower than that in Example 1, as is clear from Table 2.
Poor transparency and poor adhesion.

As described above, by using the ink jet hot melt type ink composition of the present embodiment, it is reproducible that the ink transparency on the OHP sheet, which has been a problem in the past, is significantly improved. It could be confirmed. Therefore OH
A post-processing device such as a roller for improving the transparency of the ink of the P sheet is not required, and it is possible to greatly simplify the operability of the inkjet printer and reduce the price.

[0052]

As described above, according to the present invention, the ink composition is (a) a polyamide resin in an amount of 25 to 65% by weight,
(B) 5-30 fatty acid amides or triglycerides
Since the weight percentage, the wax (c) is included in the range of 0 to 25 weight percent, and the dye (d) is included in the range of 0.5 to 5 weight percent, the light transmissivity of the ink itself is significantly improved. It is possible to obtain an ink jet hot-melt type ink composition capable of greatly improving the light transmittance of the ink itself without depending on the post-treatment device.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Ren Ito 1060 Takeda, Katsuta-shi, Ibaraki Hitachi Koki Co., Ltd. (72) Inventor Ryuichi Shimizu 4026 Kuji-cho, Hitachi, Ibaraki Hitachi Research Laboratory

Claims (1)

[Claims] 1. In an ink composition for forming recording dots by liquefying a solid ink at room temperature by heating, applying some energy to the ink and ejecting the ink onto a sheet, the composition comprises (a) polyamide resin 25 ˜65 weight percent, (b) 5 fatty acid amides or triglycerides
A hot-melt ink composition for ink jet printing, comprising: 30 to 30 weight percent, (c) a wax of 0 to 25 weight percent, and (d) a dye of 0.5 to 5 weight percent.